Manganese is an abundant element that plays critical roles and at the reaction center of several enzymes. In order to promote understanding behavior manganese(II) ion with aliphatic ligands, in this work, stability spectral complexes ethylenediamine, 1,3-propanediamine or 1,4-butanediamine were explored. A spectrophotometric study its speciation methanol was performed 293 K. The formation const...